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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac4c1b73bed265c2d6a8490e3f405d9d4e70528ae95a259ef28365b884303bc3' 
  AND token = '99dIgQ8ZGCJWoBqD+7GsmCNCvdgV6iALomggkRexoAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}